Schematic representation of the genomic structure of the mutant Japanese encephalitis viruses (JEVs) used in this study. The regions derived from GI Mie/41/2002, GV Muar, and GV XZ0934 strains are shown in blue, red, and orange, respectively. Numbers indicate nucleotide positions on the Mie/41/2002 genome. There is no difference in the amino acids at nucleotide positions 936 and 978 among the original three strains.